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ERX 8.0.x Hardware Guide
Table 13: Troubleshooting Abnormal LED Activity on Modules (continued)
Diagnostic Signs Possible Problems Actions
LINK LED is not lit Ethernet connection is down. 1. Make sure that Ethernet cables are
properly connected to both the
Ethernet port and the appropriate
network device.
2. Contact Juniper Networks Customer
Service.
RED ALM is lit System does not recognize a
port connect
ion.
Cabling is not connected
properly.
Cable is faulty.
Clocking problem exists.
1. Make sure that all cables are firmly
plugged into
the ports and the
attached network device.
2. Verify tha
tcablesareclean.
3. Test for faulty cables.
4. Verify clock source and
configuration.
5. Reset system.
NOTE: Proble
m is corrected when
normal LED activity occurs.
YEL ALM is lit
NOTE: This LED is not functional on the
HSSI line module.
F ar end receive f ailure (FERF)
exists.
1. Correct FERF problem.
2. Reset system.
NOTE: Problem is corrected when
normal LED activity occurs.
System does not boot.
Modules held offline.
FAIL LED lights.
A slot group is overloaded. 1. Issue the show version command
to display module status.
2. Reviewsectiononproperslot
group configuration in “ Installing
Modules” on page 35.
3. Reconfigure system with correct
slot group configuration.
4. Reset system.
No LED indications or obvious signs. System temperature is too high.
Vents are blocked.
Fans are not operating.
1. Look at your console for a message
indicating the problem. If you have
the system log set to a severity of
WARNING or higher, a War ning
message in dicates the failure.
2. Issue the show environment
command to display the
temperatures. If the temperature is
too high, power down the system.
3. Regulate temperature.
4. Reset system.
112 Understanding Status LEDs to Troubleshoot